1 files changed, 131 insertions, 0 deletions
diff --git a/gerrit-index/src/main/java/com/google/gerrit/index/query/AndPredicate.java b/gerrit-index/src/main/java/com/google/gerrit/index/query/AndPredicate.java
new file mode 100644
index 0000000000..7fba05fccf
--- /dev/null
+++ b/gerrit-index/src/main/java/com/google/gerrit/index/query/AndPredicate.java
@@ -0,0 +1,131 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.index.query;
+
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.gwtorm.server.OrmException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+/** Requires all predicates to be true. */
+public class AndPredicate<T> extends Predicate<T> implements Matchable<T> {
+  private final List<Predicate<T>> children;
+  private final int cost;
+
+  @SafeVarargs
+  protected AndPredicate(Predicate<T>... that) {
+    this(Arrays.asList(that));
+  }
+
+  protected AndPredicate(Collection<? extends Predicate<T>> that) {
+    List<Predicate<T>> t = new ArrayList<>(that.size());
+    int c = 0;
+    for (Predicate<T> p : that) {
+      if (getClass() == p.getClass()) {
+        for (Predicate<T> gp : p.getChildren()) {
+          t.add(gp);
+          c += gp.estimateCost();
+        }
+      } else {
+        t.add(p);
+        c += p.estimateCost();
+      }
+    }
+    children = t;
+    cost = c;
+  }
+
+  @Override
+  public final List<Predicate<T>> getChildren() {
+    return Collections.unmodifiableList(children);
+  }
+
+  @Override
+  public final int getChildCount() {
+    return children.size();
+  }
+
+  @Override
+  public final Predicate<T> getChild(int i) {
+    return children.get(i);
+  }
+
+  @Override
+  public Predicate<T> copy(Collection<? extends Predicate<T>> children) {
+    return new AndPredicate<>(children);
+  }
+
+  @Override
+  public boolean isMatchable() {
+    for (Predicate<T> c : children) {
+      if (!c.isMatchable()) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public boolean match(T object) throws OrmException {
+    for (Predicate<T> c : children) {
+      checkState(
+          c.isMatchable(),
+          "match invoked, but child predicate %s doesn't implement %s",
+          c,
+          Matchable.class.getName());
+      if (!c.asMatchable().match(object)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public int getCost() {
+    return cost;
+  }
+
+  @Override
+  public int hashCode() {
+    return getChild(0).hashCode() * 31 + getChild(1).hashCode();
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (other == null) {
+      return false;
+    }
+    return getClass() == other.getClass()
+        && getChildren().equals(((Predicate<?>) other).getChildren());
+  }
+
+  @Override
+  public String toString() {
+    final StringBuilder r = new StringBuilder();
+    r.append("(");
+    for (int i = 0; i < getChildCount(); i++) {
+      if (i != 0) {
+        r.append(" ");
+      }
+      r.append(getChild(i));
+    }
+    r.append(")");
+    return r.toString();
+  }
+}